Earth moving car



July 30, 1935. E. P. HAYWARD El AL EARTH MOVING CAR Filed Feb. 3, 1955 INVENTORS,

ATTORNEYS.

Patented July 30, 1935 UNITED STATES PATENT OFFICE I 2,009,448 EARTH MOVING CAR Edmund P. Hayward, Mount Gilead, N. 0., and

Werner Lehman, South Milwaukee, Wis., assignors to Bucyrus-Erie Company, South Milwaukee, Wis., a corporation of Delaware Application February '3, 1933, Serial No. 655,030

8 Claims.

tus shown and describedin the co-pending application of one of us, namely Werner Lehman, Serial No. 652,321, filed January 18, 1933.

It is the principal object of the present invention to provide convenient means for controlling the opening and closing of the bottom-dump door on such a car.

In addition to our principal object, we have worked out a number of novel and useful details, which will be readily evident as the description progresses.

Our invention consists in the novel parts, and 'in the combinations and arrangements thereof, which are defined in the appended claims; and of which one embodiment is exemplified in the accompanying drawing, which is hereinafter particularly described and explained.

Throughout the description, the same reference number is applied to the same member or to similar members.

Figure 1 is a side elevation of part of the abovereferred to earth moving apparatus, showing the car in position on the unloading wing.

Figure 2 is a detailed side elevation of said car exhibiting the door and its controlling parts.

Figure 3 is a vertical section of said car taken along the lines 3-3 of Figure 2.

Figure 4 is a vertical section of the brake element of our invention taken along the line 4-4 of Figure 3.

Figure 5 is a vertical section of said brake element taken along the line 5-5 of Figure 4.

Referring to the drawing it will be seen that H is the main tower of the earth moving apparatus to which Olll invention is applied.

Articulated to tower II at i2 is the unloading wing l3, wlnch is suspended from the tower by means of rope l4. Within this wing runs car IE on wheels IS on rails ll.

Wing l3 also carries auxiliary rail 18, which extends part of the length of this wing, and throughout all the remainder of the travel of the car in the rest of the apparatus. Wing 53 also carries electric rail Hi. The purpose of these two rails will be referred to later herein. Car 5 5 has a bottom-dumping door 2! hinged at 2 l.

Lever 22 extends from a pivot 23 on door 20 to a pivotal connection 24 withgear-segment lever 25. This gear segment lever engages in the gear segment lever 28, which carries at the end of its lever arm a wheel 21. This wheel engages track l8, and while in such engagement holds the door closed. While not in such engagement the door would be permitted to open under the influence of its own weight and of the dirt contained in the car, were it not for the brake to be now described. r

Gear segment lever 26 is mounted on a shaft 28, the opposite end of which carries a similar gear segment 29.

Items 22' to 25 may also be duplicated on the other side of the car.

Gear segment 29 and the gear segment portion of element 26 communicate through a chain of gears 30, 3!, 32 and 33 with shaft 34 of brake-s5.

Turning now to Figures 4 and 5, we shall discuss the details of the brake 35. Brake shaft 34 carries two spring set pawls 36 which engage an internal ratchet 3? on brake drum 38. Surrounding this drum is brake band 39.

This band'is set by a spring solenoid, which is shown only schematically in Figure 4, as it is a commercially purchasable item well-known to the electrical trade. One end 4-2 of the brake band 39 being fixed, the tension spring 43 keeps the band set except during such time as it is released by the electrical energizing of the solenoid, 44.

By virtue of all the foregoing, shaft 34 is free to rotate counterclockwise, even when the brake is set. Thus pinion 33 carried by that shaft is free to rotate counterclockwise. Thus gear 32 and pinion 3! are free to rotate clockwise. Therefore gear segment lever 26 is free to rotate counterclockwise. Thus gear segment lever 25 is free to rotate clockwise. Thus lever 22 is free to move upwardly to close door 20. Accordingly the door is always free to close, but is never free to open unless the brake is released.

The spring solenoid is electrically connected by means of trolley 45 with electric rail l9, which .in turn is electrically connected with push buttons 4|, any one of which is capable of actuating the solenoid. Accordingly the brake may be released by a push button at the operators station H engages rail l9, it then becomes possible to release the door by pressure on any of the push buttons.

When pressure on the push buttons is released the brake locks again, but the door still remains open, until on passage of the car to the left wheel 21' engages rail 18 and thereby closes the door. As already explained, due to the ratchet and pawl arrangement, the brake, although still set, does not opposethis closing of the door,- but serves to hold the door closed, when closed.

Having now described and illustrated one form of our invention, we wish it to be understood that our invention is not to be limited to the specific form or arrangement of parts hereinbefore do-- scribed, except in so far as such limitations are specified in theappended claims.

We claim:

1. In an earth-handling apparatus, the combination of a traveling car, having a bottomdump door; a longitudinal member on which'the car travels; a combined gear and lever, pivoted on the car; ,a lever pivoted at one end thereof to the door, and at the other end thereof to the lever portion of the combined gear and lever, so as to occupy a nearly toggled position when the door is either open or closed; a second combined gear and lever in geared connection with the first; a roller on the end of the lever portion of this second combined gear and lever; a guide rail on the longitudinal member, to engage the roller and thus close and hold the door closed in certain positions of the car along the longitudinal member, yet not engaging the roller and thus not holding the door closed in certain other positions of the caralong the-longitudinal member; a shaft in geared connection with the combined gears and levers; a brake drum; a ratchet and pawl connection between the shaft and the drum, permitting the shaft to rotate freely in a direction to close the door, but constraining the drum to rotatewith the shaft when the latter is rotating in a direction to open the door; a brake band, engaging the drum; a spring, tending to set the brake; a solenoid to release the brake; a trolley,

carried by the car and electrically connected with the solenoid; ,an electric rail on the longitudinal member, to engage the trolley in certain positions of the car along the longitudinal member;

and a push-button, adjacent a dumping position of the car, and electrically connected with the electric rail.

2. In an earth-handling apparatus, the combination of a traveling car, having a bottomdump door; a longitudinal member on which the car travels; a lever in operative connection with the door; a roller on the end of this lever; a guide rail on the longitudinal member, to engage the roller and thus close and hold the door closed in certain positions of the car along the longitudinal member, yet not engaging the roller and thus not holding the door closed in certain other positions of the car along the longitudinal member; a shaft,-in operative connection with the lever; a brake drum; a ratchet and pawl connection between the shaft and the drum, permitting the shaft to rotate freely in a direction to close the door, but constraining the drum to rotate with the shaft when the latter is rotating in a direction to open the door; a normally set brake band, engaging the drum; electric means to release the brake; a trolley, carried by the car and. electrically connected with said electric means; an electric rail. on the longitudinal member, to

engage the trolley in certain positions .of the car along the longitudinal member; and a push-button, electrically connected with the electric rail.

3. In an earth-handling apparatus, the combination of: a traveling car, having a bottomdump door; a longitudinal member on which the car travels; a lever'in operative connection with the door; contact means on the end of this lever; a guide rail on the longitudinal member, to engage said contact means and thus close and hold the door closed in certain positions of the car along the longitudinal member, yet not engaging said contact means and thus not holding the door closed in certain other positions of the car along the longitudinal member; a oneway brake, in operative connection with the lever; electric means to release the brake; contact means, carried by the car and electrically connected with the electric means; an electric rail on the longitudinal member, to engage the contact means in certain positions of the car along the longitudinal member; and an electric switch,

electrically connected with the electric rail.

4. In an earth-handling apparatus, the combination of: a traveling car, having a bottomdump door; a longitudinal member on which the car travels; guide means on acertain portion-of the longitudinalmember; means carried by the car, to engage the guide-meana and to close the door if open, and .to constrain the door-of the car to remain closed whenin such engagement; a one-way brake, in operative connection with the door so as at all times to freely permit the door to close, but to hold it against opening while the brakeis set; electrical means for releasing the brake; control means for such electrical means, the control-means being locatedadjacent the desired dumping position of the car;

.and means carried by the longitudinal member,

for electrically connecting'the electrical means and the control means, only when the car is on a certain portion of the longitudinal .-member.

5. Man earth-handling apparatus, the combination of .a traveling car, having a bottomdump door; a longitudinal member on which the .car travels; guide means on a certain por- ,tion of the longitudinal member; means carried by the car, to engage the guide means, and to close the door if openwhen in such engagement; a one-Way brake, in operative connection with the door so as at all times to freely permit the door to close, but to hold it against opening while the brake is set; means for releasing the brake; control means for such releasing means; and means carried by the longitudinal membeigfor operatively connecting the releasing means and i the controlmeans, only when the car is on a certain portion of the longitudinal member.

6. In an earth-handling apparatus, the combination of a traveling car, having a bottomdump door; a longitudinal. member on which the car travels; guide means on a certain portion of the longitudinal members; means carried by the car, to engage the guide means, and, when in such engagement, to close the door if open; a

one-way brake, in operative connection with the door so as at all times to freely permit the door to close, but to hold it against opening while the brake is set; and means for releasing the brake.

7. In an earth-handling apparatus, the combination of: a traveling car, having a bottomdurnp door; a longitudinal member on which the car travels; guide means on a certain portion of the longitudinal member; means carried by the car, to engage the guidemeans, and, when in such engagement, to close the door if open; brake means in operative connection with the door so as at all times to freely permit the door to close, but to hold it against opening when closed; and means for releasing the brake means.

8. In an earth-handling apparatus, the combination of: a traveling car, having a bottomdump door; a longitudinal member on which the car travels; guide means on a certain portion of the longitudinal member; means carried by the 10 car, to engage the guide means, and, when in such engagement, to close the door if open; brake means in operative connection with the door so as at all times to freely permit the door to close, but to hold it against opening when closed; means for releasing the brake means; and means whereby the releasing means is rendered operative at will only when the car is in a certain predetermined portion of its travel.

EDMUND P. HAYWARD.

WERNER LEHMAN. 

